全文获取类型
收费全文 | 76篇 |
免费 | 1篇 |
专业分类
废物处理 | 4篇 |
环保管理 | 3篇 |
综合类 | 41篇 |
基础理论 | 4篇 |
污染及防治 | 19篇 |
评价与监测 | 4篇 |
社会与环境 | 2篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2004年 | 1篇 |
1999年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1972年 | 1篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 1篇 |
1966年 | 2篇 |
1963年 | 1篇 |
1958年 | 1篇 |
1952年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
1940年 | 2篇 |
1939年 | 2篇 |
1938年 | 5篇 |
1937年 | 2篇 |
1936年 | 1篇 |
1934年 | 1篇 |
1929年 | 2篇 |
排序方式: 共有77条查询结果,搜索用时 15 毫秒
21.
Sediments as monitors of heavy metal contamination in the Ave river basin (Portugal): multivariate analysis of data 总被引:13,自引:0,他引:13
Soares HM Boaventura RA Machado AA Esteves da Silva JC 《Environmental pollution (Barking, Essex : 1987)》1999,105(3):311-323
The concentrations of heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) were determined in river sediments collected at the Ave river basin (Portugal) to obtain a general classification scenery of the pollution in this highly polluted region. Multivariate data analysis techniques of clustering, principal components and eigenvector projections were used in this classification. Five general areas with different polluting characteristics were detected and several individual heavy metal concentration abnormalities were detected in restricted areas. A good correlation between the overall metal contamination determined by multivariate analysis and metal pollution indexes for all sampling stations was obtained. Some preliminary experiments showed that the metal concentrations normalised to the volatile matter content in the sediment fraction with grain size <63 microm seems to be an adequate method for assessing metal pollution. 相似文献
22.
23.
24.
25.
26.
27.
28.
Demian A. Willette Sofia Esteves Tonya L. Kane Nicholas Pilaud Rita Rachmawati Paul H. Barber 《Conservation biology》2017,31(5):1076-1085
Seafood mislabeling is common in both domestic and international markets. Studies on seafood fraud often report high rates of mislabeling (e.g., >70%), but these studies have been limited to a single sampling year, which means it is difficult to assess the impact of stricter governmental truth‐in‐labeling regulations. We used DNA barcoding to assess seafood labeling in 26 sushi restaurants in Los Angeles over 4 years. Seafood from 3 high‐end grocery stores were also sampled (n = 16) in 2014. We ordered 9 common sushi fish from menus, preserved tissue samples in 95% ethanol, extracted the genomic DNA, amplified and sequenced a portion of the mtDNA COI gene, and identified the resulting sequence to known fish sequences from the National Center for Biotechnology Information nucleotide database. We compared DNA results with the U.S. Food and Drug Administration (FDA) list of acceptable market names and retail names. We considered sushi‐sample labels that were inconsistent with FDA names mislabeled. Sushi restaurants had a consistently high percentage of mislabeling (47%; 151 of 323) from 2012 to 2015, yet mislabeling was not homogenous across species. Halibut, red snapper, yellowfin tuna, and yellowtail had consistently high (<77%) occurrences of mislabeling on menus, whereas mislabeling of salmon and mackerel were typically low (>15%). All sampled sushi restaurants had at least one case of mislabeling. Mislabeling of sushi‐grade fish from high‐end grocery stores was also identified in red snapper, yellowfin tuna, and yellowtail, but at a slightly lower frequency (42%) than sushi restaurants. Despite increased regulatory measures and media attention, we found seafood mislabeling continues to be prevalent. 相似文献
29.
Schroeder Bruna Grosch Zanoni Patrícia Raquel Silva Magalhães Washington Luiz Esteves Hansel Fabricio Augusto Tavares Lorena Benathar Ballod 《Journal of Material Cycles and Waste Management》2017,19(1):463-472
Journal of Material Cycles and Waste Management - Finding innovative solutions to manage waste and to expand the production of biofuels are some of the current challenges. Pulp and paper sectors,... 相似文献
30.